Dephasing of solid-state qubits at optimal points

Details Dephasing of solid-state qubits at optimal points Dephasing of solid-state qubits at optimal points

2003-08-14

arxiv.org/abs/cond-mat/0308297v2

Phys. Rev. Lett. 92, 178301 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

minor corrections and clarifications

Scientific paper

10.1103/PhysRevLett.92.178301

Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on the dynamics of two-level systems at optimal operation points where the linear coupling to low-frequency fluctuations is suppressed. We study the decoherence due to nonlinear (quadratic) coupling, focusing on the experimentally relevant 1/f and Ohmic noise power spectra. For 1/f noise strong higher-order effects influence the evolution.

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